diff --git a/src/main/java/de/neemann/digital/fsm/State.java b/src/main/java/de/neemann/digital/fsm/State.java
index 800a84efa..a9cf4441f 100644
--- a/src/main/java/de/neemann/digital/fsm/State.java
+++ b/src/main/java/de/neemann/digital/fsm/State.java
@@ -28,6 +28,7 @@ public class State extends Movable<State> {
     private int radius;
     private boolean isInitial;
     private int initialAngle = 12;
+    private boolean defaultDC;
 
     /**
      * Creates a new state
@@ -46,6 +47,7 @@ public class State extends Movable<State> {
         this.number = other.number;
         this.isInitial = other.isInitial;
         this.initialAngle = other.initialAngle;
+        this.defaultDC = other.defaultDC;
         setValues(other.getValues());
         setPos(other.getPos());
     }
@@ -277,4 +279,12 @@ public class State extends Movable<State> {
             }
         };
     }
+
+    public boolean isDefaultDC() {
+        return defaultDC;
+    }
+
+    public void setDefaultDC(boolean defaultDC) {
+        this.defaultDC = defaultDC;
+    }
 }
diff --git a/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java b/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java
index 042ce97f9..816a5f5dd 100644
--- a/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java
+++ b/src/main/java/de/neemann/digital/fsm/TransitionTableCreator.java
@@ -115,8 +115,9 @@ public class TransitionTableCreator {
             int row = s.getNumber();
             int col = stateBits * 2;
             for (String name : results) {
+                int def = s.isDefaultDC() ? 2 : 0;
                 Integer val = getValues(s).get(name);
-                int v = val == null ? 0 : val;
+                int v = val == null ? def : val;
                 truthTable.setValue(row, col, v);
                 col++;
             }
@@ -129,7 +130,10 @@ public class TransitionTableCreator {
             int m = row;
             for (int j = 0; j < stateBits; j++) {
                 c--;
-                truthTable.setValue(row, c, m & 1);
+                int aValue = 2;
+                if (!s.isDefaultDC())
+                    aValue = m & 1;
+                truthTable.setValue(row, c, aValue);
                 m >>= 1;
             }
         }
diff --git a/src/main/java/de/neemann/digital/fsm/gui/FSMComponent.java b/src/main/java/de/neemann/digital/fsm/gui/FSMComponent.java
index 1c257182e..1b0eb7b81 100644
--- a/src/main/java/de/neemann/digital/fsm/gui/FSMComponent.java
+++ b/src/main/java/de/neemann/digital/fsm/gui/FSMComponent.java
@@ -31,6 +31,7 @@ import static de.neemann.digital.gui.components.CircuitComponent.ICON_DELETE;
 public class FSMComponent extends JComponent {
     private static final Key<Integer> KEY_NUMBER = new Key.KeyInteger("stateNum", 0);
     private static final Key<Boolean> KEY_INITIAL = new Key<>("isInitialState", false);
+    private static final Key<Boolean> KEY_DEFAULT_DC = new Key<>("defaultsDC", false);
     private static final Key<String> KEY_VALUES = new Key<>("stateValues", "");
     private static final Key<String> KEY_CONDITION = new Key<>("transCond", "");
     private static final Key<Integer> KEY_RADIUS = new Key.KeyInteger("transRad", 70)
@@ -179,7 +180,7 @@ public class FSMComponent extends JComponent {
         setPreferredSize(new Dimension(600, 600));
     }
 
-    private static final Key<?>[] STATE_EDIT_KEYS = {Keys.LABEL, KEY_NUMBER, KEY_INITIAL, KEY_VALUES, KEY_RADIUS};
+    private static final Key<?>[] STATE_EDIT_KEYS = {Keys.LABEL, KEY_NUMBER, KEY_INITIAL, KEY_VALUES, KEY_RADIUS, KEY_DEFAULT_DC};
 
     private void createNewState(Vector posVector, Point point) {
         ElementAttributes attr = new ElementAttributes();
@@ -207,6 +208,7 @@ public class FSMComponent extends JComponent {
         ElementAttributes attr = new ElementAttributes()
                 .set(KEY_NUMBER, state.getNumber())
                 .set(KEY_INITIAL, state.isInitial())
+                .set(KEY_DEFAULT_DC, state.isDefaultDC())
                 .set(KEY_VALUES, state.getValues())
                 .set(KEY_RADIUS, state.getVisualRadius())
                 .set(Keys.LABEL, state.getName());
@@ -218,6 +220,7 @@ public class FSMComponent extends JComponent {
         if (newAttr != null) {
             state.setNumber(newAttr.get(KEY_NUMBER));
             state.setInitial(newAttr.get(KEY_INITIAL));
+            state.setDefaultDC(newAttr.get(KEY_DEFAULT_DC));
             state.setValues(newAttr.get(KEY_VALUES));
             state.setRadius(newAttr.get(KEY_RADIUS));
             state.setName(newAttr.get(Keys.LABEL));
diff --git a/src/main/resources/lang/lang_de.xml b/src/main/resources/lang/lang_de.xml
index c4f15f3ed..11c5dd90c 100644
--- a/src/main/resources/lang/lang_de.xml
+++ b/src/main/resources/lang/lang_de.xml
@@ -2426,6 +2426,8 @@ Sie dürfen jedoch nicht oberhalb der Kopfzeile mit den Signalnamen verwendet we
     <string name="key_isInitialState_tt">Wenn gesetzt, ist dies der Initialzustand, in welchem der Automat gestartet
         wird.
     </string>
+    <string name="key_defaultsDC">Nicht definierte Werte auf DC setzen</string>
+    <string name="key_defaultsDC_tt">Setzt alle nicht definierten Werte (Folgezustand und Ausgänge) auf "Don't care"</string>
     <string name="key_stateValues">Ausgänge</string>
     <string name="key_stateValues_tt">Legt Ausgangswerte fest.
         Mit einfachen Zuweisungen wie "A=1, B=0" können Ausgänge gesetzt werden.
diff --git a/src/main/resources/lang/lang_en.xml b/src/main/resources/lang/lang_en.xml
index b1c605997..409776f56 100644
--- a/src/main/resources/lang/lang_en.xml
+++ b/src/main/resources/lang/lang_en.xml
@@ -2401,6 +2401,8 @@ However, they must not be used above the header line listing the signal names.</
     <string name="key_stateNum_tt">The number which represents this state.</string>
     <string name="key_isInitialState">Initial State</string>
     <string name="key_isInitialState_tt">If set, this state is the initial state.</string>
+    <string name="key_defaultsDC">Set undefined values to DC</string>
+    <string name="key_defaultsDC_tt">Sets all undefined values (following state and outputs) to "Don't Care".</string>
     <string name="key_stateValues">Outputs</string>
     <string name="key_stateValues_tt">Defines the output values.
         With simple assignments like "A=1, B=0" outputs can be set.